Efficient air duct

Abstract

The efficient air duct comprises a shell, a fan assembly and a heating device, the shell comprises an air duct part, a handheld part and an air inlet part connected between the air duct part and the handheld part, and the air duct part is provided with an air outlet and an air outlet duct communicated with the air outlet. The air outlet is located in the end, away from the air inlet part, of the air duct part, and the two opposite sides of the air inlet part are each provided with a first air inlet communicating with the air outlet duct. The fan assembly is arranged in the air outlet duct; the heating device comprises a silicon carbide heating body, the silicon carbide heating body is arranged in the air outlet duct, and a heat exchange surface is formed on the surface of the silicon carbide heating body so as to exchange heat with airflow flowing through the air outlet duct. According to the technical scheme, the structure of the heating device can be simplified, and the air outlet effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of hair drying devices, in particular to a high-efficiency hair dryer. Background Art

[0002] At present, hair dryers have become personal care products frequently used in daily life, mainly used for hair drying and hair styling, etc. In the heating device of a traditional hair dryer, a heating wire wound on an insulating bracket is generally used for heating. During production, the heating wire and the insulating bracket need to be manufactured separately, and then the heating wire is wound on the insulating bracket. Such a heating device has a complex structure and a large size, resulting in a large overall size of the hair dryer, such as a large size of the air duct. When air is only introduced from the rear end, it is difficult to increase the air volume and wind speed. Utility Model Content

[0003] The main purpose of the utility model is to provide a high-efficiency air duct, aiming to simplify the structure of the heating device and improve the air outlet effect.

[0004] To achieve the above-mentioned purpose, the high-efficiency air duct proposed by the utility model comprises:

[0005] The housing comprises an air duct portion, a hand-held portion, and an air inlet portion connected between the air duct portion and the hand-held portion, the air duct portion is provided with an air outlet and an air outlet duct connected to the air outlet, the air outlet is located at one end of the air duct portion away from the air inlet portion, and opposite sides of the air inlet portion are provided with first air inlets connected to the air outlet duct;

[0006] A fan assembly is disposed in the air outlet duct; and

[0007] The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the air outlet duct, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the air flow passing through the air outlet duct.

[0008] Optionally, the air inlet is further provided with a through hole, the through hole passes through two opposite sides of the air inlet, the first air inlet surrounds the outer circumference of the through hole, and the hole wall of the through hole is provided with a second air inlet connected to the air outlet duct.

[0009] Optionally, the air inlet portion is cylindrical.

[0010] Optionally, the air duct portion and the hand-held portion are arranged on a side of the air inlet portion close to the air outlet.

[0011] Optionally, the silicon carbide heating element as a whole is a columnar structure extending along the length direction of the air outlet duct.

[0012] Optionally, the high-efficiency air duct further includes a heat insulation component, which is disposed in the air duct portion and surrounds the circumference of the silicon carbide heating element.

[0013] Optionally, the outer peripheral surface of the silicon carbide heating element is provided with a convex rib, and the thermal insulation component is provided with a slot, the slot extends along the axial direction of the thermal insulation component, and the convex rib is correspondingly inserted into the slot.

[0014] Optionally, the silicon carbide heating element is arranged between the air outlet and the fan assembly.

[0015] Optionally, the silicon carbide heating element comprises a spiral body and at least two connection parts, the connection parts are provided at both ends of the spiral body, and a ventilation gap is formed between two adjacent spiral segments of the spiral body;

[0016] Optionally, the silicon carbide heating element comprises a first heating segment and two second heating segments, the first heating segment is connected between the two second heating segments, the two second heating segments both extend outwardly in a spiral from the first heating segment, a ventilation gap is formed between the two second heating segments, and a wiring portion is provided at the free end of each second heating segment;

[0017] Optionally, the silicon carbide heating element comprises an outer ring portion, a central portion located within the outer ring portion, and a plurality of connecting portions connected between the central portion and the outer ring portion, the plurality of connecting portions are spaced apart along the circumference of the central portion or the plurality of connecting portions are staggered and connected, a ventilation gap is formed between two adjacent connecting portions, the outer ring portion and the central portion are respectively provided with a wiring portion; the central portion is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the airflow direction in the air outlet duct;

[0018] Optionally, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are arranged through both ends, the extension direction of the air flow holes is consistent with the air flow direction in the air outlet duct, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with wiring parts;

[0019] Optionally, the silicon carbide heating element includes a plurality of heating segments connected in sequence, and any two adjacent heating segments are arranged at an angle, and a ventilation gap is formed between any two heating segments.

[0020] Optionally, the high-efficiency hair dryer further comprises a circuit assembly, and the fan assembly and the silicon carbide heating element are both electrically connected to the circuit assembly; the circuit assembly is disposed in the handheld portion.

[0021] The technical solution of the utility model adopts a silicon carbide heating element, so that the surface of the silicon carbide heating element is used as a heat exchange surface to directly exchange heat with the airflow flowing through the air duct. The silicon carbide heating element has a high thermal efficiency and can quickly generate heat, so that the outlet airflow can be quickly heated. Compared with the transmission electric heating wire heating device, the silicon carbide heating element is an integrated structure with a simple structure and a small size. While ensuring the heating effect, it can reduce the occupied space in the air duct. By providing a first air inlet connected to the outlet air duct on both opposite sides of the air inlet, the air intake can be increased, thereby increasing the air volume of the high-efficiency air duct and improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of an embodiment of a high-efficiency air duct of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure on the other side of the medium and high efficiency air duct;

[0025] Figure 3 for Figure 1 Cross-sectional view of a medium and high efficiency air duct;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the silicon carbide heating element;

[0027] Figure 5 for Figure 4 A schematic diagram of the structure of the silicon carbide heating element from another angle;

[0028] Figure 6 This is a schematic diagram of the structure of a silicon carbide heating element in another embodiment of the high-efficiency air duct of the utility model;

[0029] Figure 7 This is a schematic structural diagram of a silicon carbide heating element in another embodiment of the subject of the utility model;

[0030] Figure 8 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0031] Fig. 9 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model;

[0032] Fig.10 This is a schematic structural diagram of a silicon carbide heating element in yet another embodiment of the subject of the utility model.

[0033] Description of Figure Numbers:

[0034] 11. Air duct; 111. Air outlet duct; 112. Air outlet; 12. Hand-held part; 13. Air inlet; 131. First air inlet; 132. Through hole; 20. Fan assembly; 30. Silicon carbide heating element; 301. Ventilation gap; 302. Air flow hole; 31. First heating section; 32. Second heating section; 33. Heating section; 34. Outer ring; 35. Center; 36. Connecting part; 37. Wiring part; 38. Raised rib; 40. Circuit assembly; 50. Heat insulation component

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, if there are descriptions of "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The utility model provides a high-efficiency air duct.

[0039] In the embodiment of the present utility model, Figures 1 to 5As shown, the high-efficiency air duct includes a shell, a fan assembly 20 and a heating device, the shell includes an air duct portion 11, a hand-held portion 12 and an air inlet portion 13 connected between the air duct portion 11 and the hand-held portion 12, the air duct portion 11 is provided with an air outlet 112 and an air outlet duct 111 connected to the air outlet 112, the air outlet 112 is located at one end of the air duct portion 11 away from the air inlet portion 13, and first air inlets 131 connected to the air outlet duct 111 are provided on opposite sides of the air inlet portion 13; the fan assembly 20 is arranged in the air outlet duct 111; the heating device includes a silicon carbide heating element 30, the silicon carbide heating element 30 is arranged in the air outlet duct 111, and the surface of the silicon carbide heating element 30 forms a heat exchange surface for heat exchange with the airflow flowing through the air outlet duct 111.

[0040] Specifically, the high-efficiency air duct also includes a circuit assembly 40, the fan assembly 20 and the heating device (silicon carbide heating element 30) are both electrically connected to the circuit assembly 40, and the circuit assembly 40 has a circuit structure such as a controller and a power supply circuit. The specific circuit structure can refer to the prior art, and the utility model will not repeat it one by one. Optionally, the circuit assembly 40 is also provided with a power cord, and the power cord is connected to an external power supply; or the circuit assembly 40 is provided with a power interface, and the power interface is used to connect the power cord.

[0041] The silicon carbide heating element 30 is a heating structure as a whole, that is, there are at least two spaced connection parts 37 on the silicon carbide heating element 30, and the power supply circuit is connected through at least two connection parts 37. After the power is turned on, the current flows through the silicon carbide heating element 30, thereby converting the electrical energy into thermal energy. When the airflow flows through the surface of the silicon carbide heating element 30, the airflow can be heat-exchanged with the silicon carbide heating element 30, thereby heating the airflow flowing through the silicon carbide heating element 30. The surface of the silicon carbide heating element 30 refers to the surface of the silicon carbide heating element 30 that is exposed to the air and can contact the airflow, including the gap wall surface formed by the silicon carbide heating element 30 and the inner wall surface of the through hole 132.

[0042] The silicon carbide heating element 30 can be made by mixing silicon carbide powder as the main sintering phase raw material with one or more conductive phase raw materials of titanium nitride powder, zirconium nitride powder, titanium carbonitride powder, titanium carbide powder, zirconium carbide powder, thallium carbide powder, hafnium carbide powder, titanium boride powder, zirconium boride powder, molybdenum silicide powder and tungsten carbide powder, and then molding and sintering according to the designed shape. For example, silicon carbide powder, yttrium oxide powder, aluminum oxide powder and titanium boride powder can be uniformly mixed in a certain mass ratio, and then water is added as a solvent, and a ball mill is used to uniformly mix, and then spray dried, and the dry powder and paraffin are heated and mixed in a certain mass ratio, and poured into a hot die casting machine to complete hot die casting. After the blank is dried, it is placed in a sintering furnace for sintering to obtain the silicon carbide heating element 30.

[0043] The technical solution of the utility model adopts a silicon carbide heating element 30, so that the surface of the silicon carbide heating element 30 is used as a heat exchange surface to directly exchange heat with the airflow flowing through the air duct, and the silicon carbide heating element 30 has a high thermal efficiency, can quickly generate heat, and can achieve rapid heating of the outlet airflow. Compared with the transmission electric heating wire heating device, the silicon carbide heating element 30 is an integrated structure with a simple structure and a small size. While ensuring the heating effect, it can reduce the occupied space in the air duct part 11. By providing a first air inlet 131 connected to the outlet air duct 111 on both opposite sides of the air inlet part 13, the air intake volume can be increased, thereby increasing the air volume of the high-efficiency air duct, and improving the air outlet efficiency and use effect.

[0044] In some embodiments, the air inlet 13 is further provided with a through hole 132, which penetrates two opposite sides of the air inlet 13, the first air inlet 131 surrounds the outer periphery of the through hole 132, and the hole wall of the through hole 132 is provided with a second air inlet connected to the air outlet duct 111. This can further increase the air inlet area and improve the air inlet volume.

[0045] In some embodiments, the air inlet 13 is cylindrical. In this way, when the airflow enters the air inlet 13 from the first air inlet 131, it can flow smoothly to the air outlet duct 111, which can reduce losses. The side wall of the air inlet 13 can be a straight wall or a curved wall.

[0046] In some embodiments, the air channel portion 11 and the hand-held portion 12 are arranged on one side of the air inlet portion 13 close to the air outlet 112. In this way, the center of gravity of the high-efficiency air duct can be close to the hand-held portion 12, so that the user can hold and use it easily.

[0047] In some embodiments, the silicon carbide heating element 30 is disposed between the air outlet 112 and the fan assembly 20. This makes the silicon carbide heating element 30 closer to the air outlet 112, which can reduce the flow path of the hot air flow heated by the silicon carbide heating element 30 in the air duct, which is conducive to reducing heat loss. In addition, it can prevent the hot air flow from passing through the fan assembly 20, which can prevent the fan assembly 20 from overheating, and can also better dissipate heat for the fan assembly 20.

[0048] In some embodiments, the high-efficiency air duct further includes a heat insulating component 50, which is disposed in the air duct portion 11 and surrounds the circumference of the silicon carbide heating element 30. This can reduce the heat conduction of the silicon carbide heating element 30 to the outer surface of the air duct portion 11, which is conducive to reducing heat loss.

[0049] In some embodiments, a convex rib 38 is provided on the outer circumference of the silicon carbide heating element 30, and a slot is provided in the heat insulating component 50, the slot extends along the axial direction of the heat insulating component 50, and the convex rib 38 is correspondingly inserted into the slot. Specifically, the slot extends to one end of the heat insulating component 50 or the end of the slot close to one end of the heat insulating component 50 is open, so that the silicon carbide heating element 30 can be installed into the heat insulating component 50 from one end of the heat insulating component 50 in a state where the convex rib 38 corresponds to the slot.

[0050] In some embodiments, the high-efficiency air duct further includes a circuit assembly 40, and the fan assembly 20 and the silicon carbide heating element 30 are both electrically connected to the circuit assembly 40; the circuit assembly 40 is disposed in the handheld portion 12. In this way, the space in the handheld portion 12 can be fully utilized, thereby improving space utilization.

[0051] The specific structure of the silicon carbide heating element 30 can be various, for example, Figure 4 and Figure 5 In some embodiments, the silicon carbide heating element 30 includes a spiral body and at least two connection parts 37, both ends of the spiral body are provided with connection parts 37, and a ventilation gap 301 is formed between two adjacent spiral sections of the spiral body. With such a configuration, the surface area of ​​the silicon carbide heating element 30 can be larger under the same volume, and the contact area with the airflow can be increased, thereby improving the heat exchange efficiency. Among them, the silicon carbide heating element 30 can be a planar spiral structure or a tower-shaped spiral structure.

[0052] Optionally, the silicon carbide heating element 30 includes a first heating section 31 and two second heating sections 32, the first heating section 31 is connected between the two second heating sections 32, the two second heating sections 32 both extend outwardly in a spiral from the first heating section 31, a ventilation gap 301 is formed between the two second heating sections 32, and a wiring portion 37 is provided at the free end of each second heating section 32. That is, the two second heating sections 32 extend outwardly in a spiral from the first heating section 31 in parallel, so that the free ends of the two second heating sections 32 are both located on the outside, that is, the wiring portions 37 of the silicon carbide heating element 30 are both located on the outside, which makes it easier to connect the wiring while increasing the heat exchange area by utilizing the spiral structure.

[0053] In some other embodiments, reference Figure 6 The silicon carbide heating element 30 includes a plurality of heating segments 33 connected in sequence, and each of the two adjacent heating segments 33 is arranged at an angle, and a ventilation gap 301 is formed between any two heating segments 33. That is, the plurality of heating segments 33 form a bending structure according to a certain rule, so that the heat exchange area of ​​the silicon carbide heating element 30 can be increased.

[0054] In some other embodiments, reference Figure 7The silicon carbide heating element 30 is provided with a plurality of air flow holes 302, and the air flow holes 302 are through-set at both ends. The extension direction of the air flow holes 302 is consistent with the flow direction of the air flow in the air outlet duct 111, and the outer side and the central area of ​​the silicon carbide heating element 30 are respectively provided with connection parts 37.

[0055] In some other embodiments, reference Figure 8 The silicon carbide heating element 30 includes an outer ring portion 34, a central portion 35 located inside the outer ring portion 34, and a plurality of connecting portions 36 connected between the central portion 35 and the outer ring portion 34. A ventilation gap 301 is formed between two adjacent connecting portions 36. The outer ring portion 34 and the central portion 35 are respectively provided with a wiring portion 37. Optionally, the plurality of connecting portions 36 are spaced apart along the circumference of the central portion 35 (refer to Figure 8 ); or multiple connecting portions 36 are staggeredly connected (reference Fig. 9 or Fig.10 ).

[0056] Optionally, the central portion 35 is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the airflow direction in the air outlet duct 111. This can also make the heat exchange area of ​​the silicon carbide heating element 30 larger, and can improve the heat exchange efficiency.

[0057] In some embodiments, the silicon carbide heating element 30 is a columnar structure extending along the length direction of the air duct. That is, the silicon carbide heating element 30 has a certain height. Such a configuration can increase the length of the ventilation gap 301 / airflow hole 302 in the silicon carbide heating element 30, that is, the surface area of ​​the silicon carbide heating element 30 can be increased, the heat exchange area of ​​the silicon carbide heating element 30 is increased, and the heat exchange efficiency is improved.

[0058] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high-efficiency air duct, characterized in that: include: The housing comprises an air duct portion, a hand-held portion, and an air inlet portion connected between the air duct portion and the hand-held portion, the air duct portion is provided with an air outlet and an air outlet duct connected to the air outlet, the air outlet is located at one end of the air duct portion away from the air inlet portion, and opposite sides of the air inlet portion are provided with first air inlets connected to the air outlet duct; A fan assembly is disposed in the air outlet duct; and The heating device comprises a silicon carbide heating element, wherein the silicon carbide heating element is arranged in the air outlet duct, and the surface of the silicon carbide heating element forms a heat exchange surface for heat exchange with the air flow passing through the air outlet duct.

2. The high-efficiency air duct according to claim 1, characterized in that: The air inlet is further provided with a through hole, which passes through two opposite sides of the air inlet, the first air inlet surrounds the outer periphery of the through hole, and the hole wall of the through hole is provided with a second air inlet connected to the air outlet duct.

3. The high-efficiency air duct according to claim 2, characterized in that: The air inlet portion is cylindrical.

4. The high-efficiency air duct according to claim 1, characterized in that: The air channel portion and the hand-held portion are arranged on one side of the air inlet portion close to the air outlet.

5. The high-efficiency air duct according to claim 1, characterized in that: The silicon carbide heating element is in a columnar structure extending along the length direction of the air outlet duct.

6. The high-efficiency air duct according to claim 5, characterized in that: The high-efficiency air duct further comprises a heat-insulating component, which is arranged in the air duct portion and surrounds the circumference of the silicon carbide heating element.

7. The high-efficiency air duct according to claim 6, characterized in that: The outer peripheral surface of the silicon carbide heating element is provided with convex ribs, and the heat insulation component is provided with a slot, the slot extends along the axial direction of the heat insulation component, and the convex ribs are correspondingly inserted into the slot.

8. The high-efficiency air duct according to claim 1, characterized in that: The silicon carbide heating element is arranged between the air outlet and the fan assembly.

9. The high-efficiency air duct according to any one of claims 1 to 8, characterized in that: The silicon carbide heating element comprises a spiral body and at least two connection parts, both ends of the spiral body are provided with the connection parts, and a ventilation gap is formed between two adjacent spiral sections of the spiral body; Alternatively, the silicon carbide heating element comprises a first heating segment and two second heating segments, the first heating segment is connected between the two second heating segments, the two second heating segments both extend outwardly in a spiral from the first heating segment, a ventilation gap is formed between the two second heating segments, and a wiring portion is provided at the free end of each second heating segment; Alternatively, the silicon carbide heating element comprises an outer ring portion, a central portion located within the outer ring portion, and a plurality of connecting portions connected between the central portion and the outer ring portion, wherein the plurality of connecting portions are spaced apart along the circumference of the central portion or are staggeredly connected, and a ventilation gap is formed between two adjacent connecting portions, and the outer ring portion and the central portion are respectively provided with a wiring portion; the central portion is provided with a plurality of airflow holes, and the extension direction of the airflow holes is consistent with the flow direction of the airflow in the air outlet duct; Alternatively, the silicon carbide heating element is provided with a plurality of air flow holes, the air flow holes are arranged to be through-through at both ends, the extension direction of the air flow holes is consistent with the air flow direction in the air outlet duct, and the outer side and the central area of ​​the silicon carbide heating element are respectively provided with wiring parts; Alternatively, the silicon carbide heating element comprises a plurality of heating segments connected in sequence, two adjacent heating segments are arranged at an angle, and a ventilation gap is formed between any two heating segments.

10. The high-efficiency air duct according to claim 1, characterized in that: The high-efficiency hair dryer also includes a circuit assembly, and the fan assembly and the silicon carbide heating element are both electrically connected to the circuit assembly; the circuit assembly is arranged in the handheld part.

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